SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: INSERT INTO bb1_sessions (sessionhash,userid,ipaddress,useragent,lastactivity,request_uri,styleid,langid,authentificationcode) VALUES ('2687a31c02b34fb34b3b40d5763c4d6f','0','18.119.143.4','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715115838','markread.php?boardid=455&sid=a7ef745509a4a69403499ec2609bd062','0','0','')
mysql error: Duplicate entry '2687a31c02b34fb34b3b40d5763c4d6f' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 07.05.2024 @ 23:03
Script: /markread.php?boardid=455&sid=a7ef745509a4a69403499ec2609bd062
Referer: http://wehrbauten.de/markread.php?boardid=455&sid=a7ef745509a4a69403499ec2609bd062